Change image rotation kernel to be counterclockwise.

[annxingyuan]

This matches tfa.image.rotate and tf.rotate90.

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This change is 

[lina128]

Hi Ann, thank you for identifying this. Do you plan to add op rot90 too? This way, at least we can check for rotating 90 degrees the result is consistent with tf (by testing against Node backend).

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @annxingyuan, @lina128, @pyu10055, and @tafsiri)

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tfjs-core/src/ops/rotate_with_offset_test.ts, line 69 at r1 (raw file):

  });

  it('should rotate negative 90 degrees', async () => {

Can we add whether it is clockwise or counter-clockwise?

[annxingyuan]

Hi Na, yes I plan to add rot90, along with tests for tf consistency.

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @lina128, @pyu10055, and @tafsiri)

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tfjs-core/src/ops/rotate_with_offset_test.ts, line 69 at r1 (raw file):

Previously, lina128 (Na Li) wrote…

Can we add whether it is clockwise or counter-clockwise?

Done